<template>
  <div>
    <div class="search">
        <input
          type="text"
          placeholder="输入城市名或拼音"
          class="search-input"
          v-model="keyword"
        >
    </div>
    <div class="search-content" ref="search" v-show="keyword">
      <ul>
        <li
        class="search-item border-bottom"
        v-for="item of list"
        :key="item.id" @click="handleCityClick(item.name)">{{item.name}}</li>
        <li
        class="search-item border-bottom"
        v-show="hasNoData"
        >
        没有找到匹配的内容
        </li>
      </ul>
    </div>
  </div>
</template>

<script>
import Bscroll from 'better-scroll'
import {mapMutations} from 'vuex'
export default {
  name: 'CitySearch',
  props: {
    cities: Object
  },
  data () {
    return {
      keyword: '',
      list: [],
      timer: null
    }
  },
  methods: {
    ...mapMutations(['changeCityMutations']),
    handleCityClick (city) {
      this.changeCityMutations(city)
      this.keyword = ''
    }
  },
  watch: {
    keyword () {
      if (this.timer) {
        clearTimeout(this.timer)
      }
      if (!this.keyword) {
        this.list = []
        return
      }
      // 节流函数
      this.timer = setTimeout(() => {
        const result = []
        for (let i in this.cities) { // i是Object的键值
          this.cities[i].forEach((value) => {
          // this.cities[i]是一个数组，里面是许多对象
          // forEach遍历每一个对象
          // 如果我们能在spell或者name的字段中找到这个字那就放在列表之中
            if (value.spell.indexOf(this.keyword) > -1 ||
            value.name.indexOf(this.keyword) > -1) {
              result.push(value)
            }
          })
        }
        this.list = result
      }, 100)
    }
  },
  mounted () {
    this.scroll = new Bscroll(this.$refs.search)
  },
  computed: {
    hasNoData () {
      return !this.list.length
    }
  }
}
</script>

<style lang="stylus" scoped>
@import '~styles/variables.styl'
.search
  height:.72rem
  padding:0 .1rem
  background:$bgColor
  .search-input
    box-sizing:border-box
    width:100%
    height:.62rem
    line-height:.62rem
    text-align:center
    border-radius:.06rem
    color:#666
    padding:0 .1rem
.search-content
  z-index:1
  overflow:hidden
  position:absolute
  top:1.58rem
  left:0
  right:0
  bottom:0
  background:#eee
  .search-item
    line-hight:.62rem
    padding-left:.2rem
    color:#666
    background-color:#fff
</style>
